Low speed aerodynamics for ultra-quiet flight

Author / Creator

Kroeger, R. A., 1933- author

Available as

Online

Summary

A combined Aerodynamics, Acoustics and Bionics study was conducted in an attempt to discover novel mechanisms to reduce the noise associated with aircraft. flight. The strigiformes order of birds, ...

A combined Aerodynamics, Acoustics and Bionics study was conducted in an attempt to discover novel mechanisms to reduce the noise associated with aircraft. flight. The strigiformes order of birds, selected in the Bionics effort as possessing characteristics of silent flight, was studied extensively. Three mechanism producing the potential for acoustic quieting were discovered as a result of this study. These are: 1. Vortex sheet generators. 2. Compliant surfaces and 3. Distributed wing porosity. An experimental program aimed at initiating full scale flight evaluation of these concepts was outlined. The detailed results of these studies are included.

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